GMSH EXAMPLES CODE

Get the tags of the model entities making up the physical group of dimension dim and tag tag. If dim’ is >= 0, return only the entities of the specified dimension. Get all the physical groups in the current model. Physical entities to Elementary entities Basics Name Numerous useful functions are provided by GMSH API, even Lagrange (and their Gradient) basis function. Segment tags composing Line (1 ) Number of nodes per segment: 2 Element Tag (1 )= Element Tag (2 )= Element Tag (3 )= Element Tag (4 )= Element Tag (5 )= Element Tag (6 )= Element Tag (7 )= Element Tag (8 )= Element Tag (9 )= Element Tag (10 )= Integration points, jacobian, FEM basis functions, … Return elementName, dim, order, numNodes, nodeCoord, numPrimaryNodes.Īs for the node, you can copy/paste these lines before gmsh.write('square.msh'): Get the properties of an element of type elementType: its name( elementName), dimension ( dim), order ( order), number of nodes( numNodes), coordinates of the nodes in the reference element( nodeCoord vector, of length dim times numNodes) and number ofprimary (first order) nodes ( numPrimaryNodes). Get the elements of type elementType classified on the entity of tag tag. GetElementsByType(elementType, tag=-1, task=0, numTasks=1) Get the types of elements in the ( elementary) entity of dimension dim and ( elementary) tag tag. Return elementTypes, elementTags, nodeTags Get the elements classified on the ( elementary) entity of dimension dim and ( elementary) tag tag. This is a sometimes useful but inefficient way of accessing elements, as it relies on a cache stored in the model. Get the type and node tags of the element with ( elementary) tag tag. Nodes tag on Physical Line 1 Nodes coordinates on Physical Line 1 [0.

GMSH EXAMPLES CODE

Start from the code meshing a square that has been given above and override these line The other arguments are treated as in getNodes. Get the nodes classified on the entity of tag tag, for all the elements of type elementType. GetNodesByElementType(elementType, tag=-1, returnParametricCoord=True) Gmsh is built around four modules: geometry, mesh, solver and post-processing. Get the nodes from all the elements belonging to the physical group of dimension dim and tag tag. Get the nodes classified on the entity of dimension dim and tag tag. GetNodes(dim=-1, tag=-1, includeBoundary=False, returnParametricCoord=True) Generally, the first quantity of the returned array is what you want. Get the coordinates and the parametric coordinates (if any) of the node with tag tag. For example, to call getNode(12), you should type (12). I get the same behavior whether I set nonManifoldMode to true or false.Methods to get and modify mesh element are placed in the namespace. Therefore, a solid cannot be created and meshing fails. When I get the shapes back, the compound has 3 shells, but only 2 of them are closed the third one (which should correspond to box3) has only 5 faces. MySewingTool.SetNonManifoldMode(Standard_True) Īdd the three shapes (box2, box3, and the result of cutting). I cut the two small boxes out of box1 (using BRepAlgoAPI_Cut), and then I use: Pretty much, two small boxes on top of each other (box2 and box3), and they should be covered by box1. TopoDS_Solid box3 = BRepPrimAPI_MakeBox(gp_Pnt(2,2,1), 1, 1, 1) TopoDS_Solid box2 = BRepPrimAPI_MakeBox(gp_Pnt(1,1,0), 3, 3, 1) TopoDS_Solid box1 = BRepPrimAPI_MakeBox(gp_Pnt(0,0,0), 6, 6, 6) However, if I try a more complicated operation, I get this strange thing. These shells are closed, and can build the solids out of them. If I do sewing for those two boxes, I get a compound of shells. I've tried something along these lines, but I get something strange. I've tried to use BRepAlgoAPI_Fuse and BRepBuilderAPI_Sewing, but the first one creates a single shape out of cube A and B (I still want to mesh each one separately, since in my model they could be of different materials) and the second one seems to output the empty shell of the two cubes, so 3d meshing does not work. This way, in the mesher, the common face is meshed exactly once, and the 3d mesh could be build from there. What I want would be an operation such that, given the two cubes laying on top of each other, extracts this common face and rebuilds the two shapes (cubes) in such a way that the common face is part of both cube A and cube B. Now, the issue in trying to mesh this structure is that the top side of cube B and bottom side of cube A are meshed separately, which causes problems with non-aligned points. Now, the bottom side of cube A touches the top side of cube B the size of the overlap being a 1x1 square. I'm looking at a very simple example, imagine a cube A of size (1,1,1) sitting on top of cube B of size (3,3,3), aligned vertically. The issue here is a bit different though, maybe I should post it in a separate thread. The funny thing is that Gmsh uses Netgen for mesh generation too.

Gmsh examples